Free OS & Utility Software
Knoppix
Knoppix is a GNU/Linux distribution that boots and runs completely from CD or DVD and can be used to read and write Windows and other partitions (among other clever tricks). The Knoppix CD and DVD include recent Linux software and desktop environments.
CentOS
The CentOS Linux distribution is a stable, predictable, manageable and reproducible platform derived from the sources of Red Hat Enterprise Linux (RHEL). The operating system is built with community-driven efforts and is released free and open-source under the GPLv2. Since March 2004, CentOS has been used to power servers and desktops across the world, and the project is still going strong to this day.
Deepin
Deepin is a free and open-source Linux distribution based on Debian. The distribution is developed by the Chinese company Wuhan Deepin Technology. Deepin features the modern looking Deepin Desktop Environment and its own app store, the Deepin Store. The Deepin Desktop Environment which is built with Qt can also be used on other Linux distribution including Arch Linux, Fedora, Manjaro and Ubuntu.
Drauger OS
Drauger OS is a free and open-source, leight-weight Linux distribution designed for gaming. Drauger OS has an overhauled desktop, the xanmod kernel for better graphics performance, and enhanced multi-lingual support. Drauger OS development aims to make Drauger OS available for as many people and devices as possible.
FreeBSD
FreeBSD is a free and open-source Unix-like operating system descended from the Berkeley Software Distribution. FreeBSD was first released as in 1993, and is today the most popular free and open-source BSD operating system on the market today. In total, FreeBSD accounts for more than 75% of the market. FreeBSD can be installed easily on most machines and is licensed under the permissive BSD License.
Ubuntu Budgie
Ubuntu Budgie is an official community flavor of the Linux distribution Ubuntu featuring the Budgie desktop. It combines the stable and thoroughly-tested Ubuntu core with a modern, lightweight and traditional-looking desktop developed by the Solus project. The desktop is adaptable to any device, keeping them fast and usable.
Solus
Solus is a Linux-based operating system that is designed for home computing. The OS is released as free and open-source software under the GNU General Public Licesense. Solus is a perfect replacement for macOS or Windows and delivers a cohesive computing experience loved by many.
HardenedBSD
HardenedBSD is a security-enhanced fork of FreeBSD. The HardenedBSD Project is implementing many exploit mitigation and security technologies on top of FreeBSD. Allowing penetration testers and system security experts to enjoy a prebuilt suite of tools on top of FreeBSD.
Pop!_OS
Pop!_OS is a free and open-source Linux operating system for STEM and creative professionals who use their computer as a tool to discover and create. Pop!_OS is openly developed and released by the Linux hardware manufacturer System76. With Pop!_OS you can unleash your potential on secure, reliable open source software. Pop!_OS is designed for fast navigation, easy workspace organization, and fluid, convenient workflow. Your operating system should encourage discovery, not obstruct it.
Time Machine
With Time Machine you can create automatic backups for macOS. All you need is an external storage device that is connected to your computer and Time Machine will create daily, weekly and monthly backups that can be restored instantly. You can even browse previous snapshot before deciding to revert back to an older version of your hard-drive.